My wife had exactly the same opinion. The water was from my aquarium, and, after I did a little research about this particular amoebae, I started to handle things with more care. Apparently, this particular variety can cause illness in humans.
As for the photography, setup, focus, and lighting turned out to be much harder than I expected. I spent the better part of a day just getting these. It turns out the QHY2 download time is too long for most of the more active protozoa using the two frame exposure. One frame exposures are slower, and of course, binning automatically eliminated color photography.
By the way, I really like your website. Very informative and good data, I use it often for information about the cameras.